diff --git a/IO.cpp b/IO.cpp
index 00521aa..b419cfe 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -1,8 +1,8 @@
 /*
  *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
- *   Copyright (C) 2017 by Danilo DB4PLE 
- 
+ *   Copyright (C) 2017 by Danilo DB4PLE
+
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
@@ -105,9 +105,9 @@ void CIO::process()
   uint8_t bit;
   uint32_t scantime;
   uint8_t  control;
-  
+
   m_ledCount++;
-  
+
   if (m_started) {
     // Two seconds timeout
     if (m_watchdog >= 19200U) {
@@ -194,7 +194,7 @@ void CIO::process()
 
   if (m_rxBuffer.getData() >= 1U) {
     m_rxBuffer.get(bit, control);
-    
+
     switch (m_modemState_prev) {
       case STATE_DSTAR:
         dstarRX.databit(bit);
@@ -229,9 +229,9 @@ void CIO::process()
 }
 
 void CIO::start()
-{ 
+{
   m_TotalModes = 0U;
-  
+
   if(m_dstarEnable) {
     m_Modes[m_TotalModes] = STATE_DSTAR;
     m_TotalModes++;
@@ -252,7 +252,7 @@ void CIO::start()
     m_Modes[m_TotalModes] = STATE_NXDN;
     m_TotalModes++;
   }
-  
+
 #if defined(ENABLE_SCAN_MODE)
   if(m_TotalModes > 1U)
     m_scanEnable = true;
@@ -267,9 +267,9 @@ void CIO::start()
 
   if (m_started)
     return;
-    
+
   startInt();
-    
+
   m_started = true;
 }
 
@@ -284,7 +284,7 @@ void CIO::write(uint8_t* data, uint16_t length, const uint8_t* control)
     else
       m_txBuffer.put(data[i], control[i]);
   }
-  
+
   // Switch the transmitter on if needed
   if (!m_tx) {
     setTX();
@@ -338,6 +338,30 @@ uint8_t CIO::setFreq(uint32_t frequency_rx, uint32_t frequency_tx, uint8_t rf_po
     return 4U;
 #endif
 
+// Check if we have a single, dualband or duplex board
+#if defined (ZUMSPOT_ADF7021)
+ if (!(io.hasSingleADF7021())) {
+    // There are two ADF7021s on the board
+    if (io.isDualBand()) {
+      // Dual band
+      if ((frequency_tx <= VHF2_MAX) && (frequency_rx <= VHF2_MAX)) {
+        // Turn on VHF side
+        io.setBandVHF(true);
+      } else if ((frequency_tx >= UHF1_MIN) && (frequency_rx >= UHF1_MIN)) {
+        // Turn on UHF side
+        io.setBandVHF(false);
+      }
+    } else if (!io.isDualBand()) {
+      // Duplex board
+      if ((frequency_tx < UHF1_MIN) || (frequency_rx < UHF1_MIN)) {
+        // Reject VHF frequencies
+        return 4U;
+      }
+    }
+  }
+
+#endif
+
   // Configure frequency
   m_frequency_rx = frequency_rx;
   m_frequency_tx = frequency_tx;
diff --git a/IO.h b/IO.h
index b455cff..bbc546b 100644
--- a/IO.h
+++ b/IO.h
@@ -1,8 +1,8 @@
 /*
  *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
  *   Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
- *   Copyright (C) 2017 by Danilo DB4PLE 
- 
+ *   Copyright (C) 2017 by Danilo DB4PLE
+
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
@@ -124,6 +124,9 @@ public:
   uint32_t  getWatchdog(void);
   void      getIntCounter(uint16_t &int1, uint16_t &int2);
   void      selfTest(void);
+  void      setBandVHF(bool vhf_on);
+  bool      hasSingleADF7021(void);
+  bool      isDualBand(void);
 
   // RF interface API
   void      setTX(void);
@@ -164,7 +167,7 @@ private:
   uint16_t           m_RX_F_divider;
   uint8_t            m_TX_N_divider;
   uint16_t           m_TX_F_divider;
-  
+
   bool               m_started;
   CBitRB             m_rxBuffer;
   CBitRB             m_txBuffer;
diff --git a/IOSTM.cpp b/IOSTM.cpp
index 5b77e04..6c75837 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -115,6 +115,15 @@
 #define PIN_RXD              GPIO_Pin_4
 #define PORT_RXD             GPIOB
 
+#define PIN_SGL_DBL          GPIO_Pin_12
+#define PORT_SGL_DBL         GPIOA
+
+#define PIN_DL_DPX           GPIO_Pin_15
+#define PORT_DL_DPX          GPIOC
+
+#define PIN_SET_BAND         GPIO_Pin_15
+#define PORT_SET_BAND        GPIOA
+
 // TXD used in SPI Data mode of ADF7021
 // TXD is TxRxCLK of ADF7021, standard TX/RX data interface
 #define PIN_TXD              GPIO_Pin_3
@@ -122,6 +131,17 @@
 #define PIN_TXD_INT          GPIO_PinSource3
 #define PORT_TXD_INT         GPIO_PortSourceGPIOB
 
+#if defined(DUPLEX)
+#define PIN_RXD2             GPIO_Pin_11
+#define PORT_RXD2            GPIOA
+
+// TXD2 is TxRxCLK of the second ADF7021, standard TX/RX data interface
+#define PIN_TXD2             GPIO_Pin_8
+#define PORT_TXD2            GPIOA
+#define PIN_TXD2_INT         GPIO_PinSource8
+#define PORT_TXD2_INT        GPIO_PortSourceGPIOA
+#endif
+
 // CLKOUT used in SPI Data mode of ADF7021
 #define PIN_CLKOUT           GPIO_Pin_15
 #define PORT_CLKOUT          GPIOA
@@ -280,10 +300,17 @@ extern "C" {
 
 #if defined(DUPLEX)
   void EXTI9_5_IRQHandler(void) {
+    #if defined(ZUMSPOT_ADF7021)
+    if(EXTI_GetITStatus(EXTI_Line8)!=RESET) {
+      io.interrupt2();
+    EXTI_ClearITPendingBit(EXTI_Line8);
+    }
+    #else
     if(EXTI_GetITStatus(EXTI_Line5)!=RESET) {
       io.interrupt2();
     EXTI_ClearITPendingBit(EXTI_Line5);
     }
+    #endif
   }
 #endif
 
@@ -301,13 +328,37 @@ void CIO::Init()
 #endif
 
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
-  
+
 #if defined(PI_HAT_7021_REV_02)
   GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable, ENABLE);
 #elif defined(ZUMSPOT_ADF7021) || defined(LIBRE_KIT_ADF7021) || defined(MMDVM_HS_HAT_REV12) || defined(MMDVM_HS_DUAL_HAT_REV10) || defined(NANO_HOTSPOT) || defined(NANO_DV_REV11) || defined(D2RG_MMDVM_HS)
   GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
 #endif
 
+#if defined(ZUMSPOT_ADF7021)
+  // Pin defines if the board has a single ADF7021 or double
+  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStruct.GPIO_Pin   = PIN_SGL_DBL;
+  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IPU;
+  GPIO_Init(PORT_SGL_DBL, &GPIO_InitStruct);
+
+  // Pin defines if the board is dual band or duplex
+  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStruct.GPIO_Pin   = PIN_DL_DPX;
+  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IPU;
+  GPIO_Init(PORT_DL_DPX, &GPIO_InitStruct);
+
+  // Pin will set UHF or VHF
+  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStruct.GPIO_Pin   = PIN_SET_BAND;
+  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
+  GPIO_Init(PORT_SET_BAND, &GPIO_InitStruct);
+  // TODO: Remove this line
+  // GPIO_WriteBit(PORT_SET_BAND, PIN_SET_BAND, Bit_RESET);
+
+#endif
+
+#if defined(STM32_USB_HOST)
   // Pin PA11,PA12 = LOW, USB Reset
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_11 | GPIO_Pin_12;
@@ -316,6 +367,8 @@ void CIO::Init()
   GPIO_WriteBit(GPIOA, GPIO_Pin_11, Bit_RESET);
   GPIO_WriteBit(GPIOA, GPIO_Pin_12, Bit_RESET);
 
+#endif
+
 #if defined(LONG_USB_RESET)
   // 10 ms delay
   delay_us(10000U);
@@ -343,7 +396,7 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Pin   = PIN_SDATA;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_SDATA, &GPIO_InitStruct);
-  
+
   // Pin SREAD
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_SREAD;
@@ -355,14 +408,14 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Pin   = PIN_SLE;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_SLE, &GPIO_InitStruct);
-  
+
 #if defined(DUPLEX)
   // Pin SLE2
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_SLE2;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_SLE2, &GPIO_InitStruct);
-  
+
   // Pin RXD2
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_RXD2;
@@ -393,6 +446,7 @@ void CIO::Init()
 #endif
   GPIO_Init(PORT_TXD, &GPIO_InitStruct);
 #if defined(DUPLEX)
+  GPIO_InitStruct.GPIO_Pin   = PIN_TXD2;
   GPIO_Init(PORT_TXD2, &GPIO_InitStruct);
 #endif
 
@@ -403,7 +457,7 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IN_FLOATING;
   GPIO_Init(PORT_CLKOUT, &GPIO_InitStruct);
 #endif
- 
+
   // Pin LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_LED;
@@ -416,37 +470,37 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_DEB, &GPIO_InitStruct);
 
-  // D-Star LED 
+  // D-Star LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_DSTAR_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_DSTAR_LED, &GPIO_InitStruct);
 
-  // DMR LED 
+  // DMR LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_DMR_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_DMR_LED, &GPIO_InitStruct);
 
-  // YSF LED 
+  // YSF LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_YSF_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_YSF_LED, &GPIO_InitStruct);
 
-  // P25 LED 
+  // P25 LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_P25_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_P25_LED, &GPIO_InitStruct);
 
-  // NXDN LED 
+  // NXDN LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_NXDN_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_NXDN_LED, &GPIO_InitStruct);
 
-  // POCSAG LED 
+  // POCSAG LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_POCSAG_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
@@ -458,7 +512,7 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_PTT_LED, &GPIO_InitStruct);
 
-  // COS LED 
+  // COS LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_COS_LED;
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
@@ -496,7 +550,11 @@ void CIO::Init()
   // Connect EXTI5 Line
   GPIO_EXTILineConfig(PORT_TXD2_INT, PIN_TXD2_INT);
   // Configure EXT5 line
+  #if defined(ZUMSPOT_ADF7021)
+  EXTI_InitStructure2.EXTI_Line = EXTI_Line8;
+  #else
   EXTI_InitStructure2.EXTI_Line = EXTI_Line5;
+  #endif
 #endif
 
 #endif
@@ -505,7 +563,7 @@ void CIO::Init()
   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStructure);
-  
+
 #if defined(DUPLEX)
   EXTI_InitStructure2.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStructure2.EXTI_Trigger = EXTI_Trigger_Rising;
@@ -517,7 +575,7 @@ void CIO::Init()
 void CIO::startInt()
 {
   NVIC_InitTypeDef NVIC_InitStructure;
-  
+
 #if defined(DUPLEX)
   NVIC_InitTypeDef NVIC_InitStructure2;
 #endif
@@ -546,7 +604,7 @@ void CIO::startInt()
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 15;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
-  
+
 #if defined(DUPLEX)
   NVIC_InitStructure2.NVIC_IRQChannelPreemptionPriority = 1;
   NVIC_InitStructure2.NVIC_IRQChannelSubPriority = 15;
@@ -557,18 +615,18 @@ void CIO::startInt()
 
 #if defined(BIDIR_DATA_PIN)
 // RXD pin is bidirectional in standard interfaces
-void CIO::Data_dir_out(bool dir) 
+void CIO::Data_dir_out(bool dir)
 {
   GPIO_InitTypeDef GPIO_InitStruct;
 
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_RXD;
-  
+
   if(dir)
     GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   else
     GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IN_FLOATING;
-  
+
   GPIO_Init(PORT_RXD, &GPIO_InitStruct);
 }
 #endif
@@ -696,6 +754,17 @@ void CIO::COS_pin(bool on)
   GPIO_WriteBit(PORT_COS_LED, PIN_COS_LED, on ? Bit_SET : Bit_RESET);
 }
 
+void CIO::setBandVHF(bool vhf_on) {
+  GPIO_WriteBit(PORT_SET_BAND, PIN_SET_BAND, vhf_on ? Bit_SET : Bit_RESET);
+}
+
+bool CIO::hasSingleADF7021() {
+  return GPIO_ReadInputDataBit(PORT_SGL_DBL, PIN_SGL_DBL) == Bit_SET;
+}
+
+bool CIO::isDualBand() {
+  return GPIO_ReadInputDataBit(PORT_DL_DPX, PIN_DL_DPX) == Bit_SET;
+}
 
 /**
  * Function delay_us() from stm32duino project
diff --git a/SerialPort.cpp b/SerialPort.cpp
index ea0af12..917a2d8 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -318,6 +318,11 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
     DEBUG1("Full duplex not supported with this firmware");
     return 6U;
   }
+#elif defined(DUPLEX) && defined(ZUMSPOT_ADF7021)
+  if (io.isDualBand() && m_duplex && m_calState == STATE_IDLE && modemState != STATE_DSTARCAL) {
+    DEBUG1("Full duplex is not supported on this board");
+    return 6U;
+  }
 #endif
 
   dstarTX.setTXDelay(txDelay);
diff --git a/configs/ZUMspot_dualband.h b/configs/ZUMspot_dualband.h
new file mode 100644
index 0000000..f21c673
--- /dev/null
+++ b/configs/ZUMspot_dualband.h
@@ -0,0 +1,109 @@
+/*
+ *   Copyright (C) 2017,2018,2019 by Andy Uribe CA6JAU
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(CONFIG_H)
+#define  CONFIG_H
+
+// Select one board (STM32F103 based boards)
+// 1) ZUMspot RPi or ZUMspot USB:
+#define ZUMSPOT_ADF7021
+// 2) Libre Kit board or any homebrew hotspot with modified RF7021SE and Blue Pill STM32F103:
+// #define LIBRE_KIT_ADF7021
+// 3) MMDVM_HS_Hat revisions 1.1, 1.2 and 1.4 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
+// 4) MMDVM_HS_Dual_Hat revisions 1.0 (DB9MAT & DF2ET & DO7EN)
+// #define MMDVM_HS_DUAL_HAT_REV10
+// 5) Nano hotSPOT (BI7JTA)
+// #define NANO_HOTSPOT
+// 6) NanoDV NPi or USB revisions 1.0 (BG4TGO & BG5HHP)
+// #define NANO_DV_REV10
+
+// Enable ADF7021 support:
+#define ENABLE_ADF7021
+
+// Enable full duplex support with dual ADF7021 (valid for homebrew hotspots only):
+// #define DUPLEX
+
+// TCXO of the ADF7021
+// For 14.7456 MHz:
+#define ADF7021_14_7456
+// For 12.2880 MHz:
+// #define ADF7021_12_2880
+
+// Configure receiver gain for ADF7021
+// AGC automatic, default settings:
+#define AD7021_GAIN_AUTO
+// AGC automatic with high LNA linearity:
+// #define AD7021_GAIN_AUTO_LIN
+// AGC OFF, lowest gain:
+// #define AD7021_GAIN_LOW
+// AGC OFF, highest gain:
+// #define AD7021_GAIN_HIGH
+
+// Host communication selection:
+#define STM32_USART1_HOST
+// #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
+
+// Enable mode detection:
+#define ENABLE_SCAN_MODE
+
+// Send RSSI value:
+#define SEND_RSSI_DATA
+
+// Enable Nextion LCD serial port repeater on USART2 (ZUMspot Libre Kit and ZUMspot RPi):
+#define SERIAL_REPEATER
+#define SERIAL_REPEATER_BAUD 9600
+
+// Enable Nextion LCD serial port repeater on USART1 (Do not use with STM32_USART1_HOST enabled):
+// #define SERIAL_REPEATER_USART1
+
+// Enable P25 Wide modulation:
+// #define ENABLE_P25_WIDE
+
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
+// Engage a constant or descreet Service LED mode once repeater is running
+// #define CONSTANT_SRV_LED
+// #define CONSTANT_SRV_LED_INVERTED
+// #define DISCREET_SRV_LED
+// #define DISCREET_SRV_LED_INVERTED
+
+// Use the YSF and P25 LEDs for NXDN
+// #define USE_ALTERNATE_NXDN_LEDS
+
+// Use the D-Star and DMR LEDs for POCSAG
+// #define USE_ALTERNATE_POCSAG_LEDS
+
+// Enable for RPi 3B+, USB mode
+// #define LONG_USB_RESET
+
+// Enable modem debug messages
+#define ENABLE_DEBUG
+
+// Disable frequency bands check
+// #define DISABLE_FREQ_CHECK
+
+// Disable frequency restrictions (satellite, ISS, etc)
+// #define DISABLE_FREQ_BAN
+
+#endif
diff --git a/configs/ZUMspot_duplex.h b/configs/ZUMspot_duplex.h
index 1a5a05d..e90676f 100644
--- a/configs/ZUMspot_duplex.h
+++ b/configs/ZUMspot_duplex.h
@@ -21,9 +21,9 @@
 
 // Select one board (STM32F103 based boards)
 // 1) ZUMspot RPi or ZUMspot USB:
-// #define ZUMSPOT_ADF7021
+#define ZUMSPOT_ADF7021
 // 2) Libre Kit board or any homebrew hotspot with modified RF7021SE and Blue Pill STM32F103:
-#define LIBRE_KIT_ADF7021
+// #define LIBRE_KIT_ADF7021
 // 3) MMDVM_HS_Hat revisions 1.1, 1.2 and 1.4 (DB9MAT & DF2ET)
 // #define MMDVM_HS_HAT_REV12
 // 4) MMDVM_HS_Dual_Hat revisions 1.0 (DB9MAT & DF2ET & DO7EN)
@@ -52,14 +52,14 @@
 #define AD7021_GAIN_AUTO
 // AGC automatic with high LNA linearity:
 // #define AD7021_GAIN_AUTO_LIN
-// AGC OFF, lowest gain: 
+// AGC OFF, lowest gain:
 // #define AD7021_GAIN_LOW
 // AGC OFF, highest gain:
 // #define AD7021_GAIN_HIGH
 
 // Host communication selection:
-// #define STM32_USART1_HOST
-#define STM32_USB_HOST
+#define STM32_USART1_HOST
+// #define STM32_USB_HOST
 // #define STM32_I2C_HOST
 
 // I2C host address:
@@ -69,7 +69,7 @@
 #define ENABLE_SCAN_MODE
 
 // Send RSSI value:
-// #define SEND_RSSI_DATA
+#define SEND_RSSI_DATA
 
 // Enable Nextion LCD serial port repeater on USART2 (ZUMspot Libre Kit and ZUMspot RPi):
 #define SERIAL_REPEATER
@@ -84,7 +84,7 @@
 // Disable mode LEDs blink during scan mode:
 // #define QUIET_MODE_LEDS
 
-// Engage a constant or descreet Service LED mode once repeater is running 
+// Engage a constant or descreet Service LED mode once repeater is running
 // #define CONSTANT_SRV_LED
 // #define CONSTANT_SRV_LED_INVERTED
 // #define DISCREET_SRV_LED
@@ -97,10 +97,10 @@
 // #define USE_ALTERNATE_POCSAG_LEDS
 
 // Enable for RPi 3B+, USB mode
-#define LONG_USB_RESET
+// #define LONG_USB_RESET
 
 // Enable modem debug messages
-// #define ENABLE_DEBUG
+#define ENABLE_DEBUG
 
 // Disable frequency bands check
 // #define DISABLE_FREQ_CHECK
diff --git a/scripts/build_fw.sh b/scripts/build_fw.sh
index a70ea1b..d93c0c9 100755
--- a/scripts/build_fw.sh
+++ b/scripts/build_fw.sh
@@ -40,10 +40,16 @@ make clean
 
 # Building ZUMspot Duplex
 cp ~/MMDVM_HS/configs/ZUMspot_duplex.h ~/MMDVM_HS/Config.h
-make bl
+make
 mv ~/MMDVM_HS/bin/mmdvm_f1bl.bin ~/MMDVM_HS/bin/zumspot_duplex_fw.bin
 make clean
 
+# Building ZUMspot Dualband
+cp ~/MMDVM_HS/configs/ZUMspot_dualband.h ~/MMDVM_HS/Config.h
+make
+mv ~/MMDVM_HS/bin/mmdvm_f1bl.bin ~/MMDVM_HS/bin/zumspot_dualband_fw.bin
+make clean
+
 # Building MMDVM_HS_Hat
 cp ~/MMDVM_HS/configs/MMDVM_HS_Hat.h ~/MMDVM_HS/Config.h
 make